The AFL Commission was given an update on Monday at its final meeting of the year on plans for the January 30 summit, designed to tackle an issue Collingwood chief executive Gary Pert has labelled the most pressing facing the sport.

It's understood Harcourt and Unglik will speak in general terms, without specific reference to any players or potential club-based issues. They could also call on the results and trends of this year, although those figures are usually not released publicly until mid-year.

Harcourt also spoke at the AFL Players Association board and delegates meeting on Friday, at which players demanded they be invited to the meeting of club CEOs.

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The AFL has invited AFLPA chief executive Matt Finnis, president Luke Ball and several players.

Players have said they are happy with the current three-strikes model but remain open to change.

But several clubs want to know as soon as a player has tested positive - rather than waiting until a third positive strike - and also want to close loopholes. There is also some support for more out-of-season testing when players are away from their clubs.

League headquarters will close for the Christmas and New Year break this week, meaning the investigation into tanking claims against Melbourne and a crackdown of third-party payments to players, notably Chris Judd's deal with Visy, will continue into 2013.